摘要
针对钢衬钢筋混凝土压力管道在运行期因裂缝过宽导致的结构耐久性问题,在混凝土中掺入体积率分别为0.5%、1.0%、1.5%、2.0%的钢纤维形成钢纤维混凝土,基于模型试验获得的钢纤维混凝土的拉伸软化曲线,采用大型数值分析平台ABAQUS仿真分析了钢衬钢筋钢纤维混凝土压力管道受力开裂的全过程,并与原钢衬钢筋混凝土压力管道的模型试验结果进行了对比分析。结果表明,在相同内水压力荷载下,钢衬钢筋钢纤维混凝土压力管道的承载能力与普通钢衬钢筋混凝土压力管道相比,不仅其初裂荷载有所提高,管道的最大裂缝宽度明显降低,钢材的应力值也随钢纤维体积率的增加而减少。
In terms of solving the problem of structure durability for conventional steel lined reinforced concrete penstock,steel fiber concrete were adopted to control crack width of out packed reinforced concrete.The steel fiber reinforced concrete was prepared by mixing the steel fiber by the volume ratio of 0.5%,1.0%,1.5%and 2.0%,and the tension softening curve of steel fiber reinforced concrete was obtained based on the model experiment.The whole process of cracking of steel lined steel fiber reinforced concrete penstock was simulated by ABAQUS.By comparing with the original penstock design,the results show that the bearing capacity of steel fiber reinforced concrete penstock is higher than that of the original under the same internal water pressure loads.The initial cracking loads of penstocks increases and the concrete cracking significantly decreases.The stress values of steel also decrease with the increase of fiber volume fraction.
引文
[1]夏敏.坝后背管外包混凝土裂缝宽度计算公式探讨[J].混凝土,2011(9):36-39,43.
[2]王康平,伏义淑,邱卫民.钢衬钢筋混凝土压力管道裂缝计算公式研究[J].三峡大学学报:自然科学版,2000,22(4):278-282.
[3]郝蓓蓓,龚爱民,彭玉林,等.硅粉掺量对钢纤维硅粉混凝土力学性能的影响[J].水电能源科学,2016,34(9):144-147.
[4]杨耀,吴汉明,杨学堂,等.三峡压力管道裂缝性态试验研究[J].三峡大学学报:自然科学版,1998,20(3):47-50.
[5]曹明.ABAQUS损伤塑性模型损伤因子计算方法研究[J].交通标准化,2012(2):51-54.
[6]CECS38:2004,纤维混凝土结构技术规程[S].北京:中国计划出版社,2004.
[7]朱军.钢纤维混凝土受弯构件裂缝宽度计算方法研究[J].山西建筑,2013,39(24):37-39.